docs: def get(self):
          """Gets a single item from the queue and returns it. If the queue is empty, this method will return None.
  
          Returns:
              :class:`contracts.Envelope`. a telemetry envelope object or None if the queue is empty.
          """
          try:
              item = self._queue.get_nowait()
          except (Empty, PersistEmpty):
              return None
  
          if self._persistence_path:
              self._queue.task_done()
  
          return item